Construction of reenforced-concrete columns or posts



F. W. BRADSHAW. ENFORCED CONCRETE APPLICATION FILED APR. 28.

COLUMNS on POSTS. I920.

CONSTRUCTION OF RE 1,4173445.

Patentd May 23, 1922.

rah?

rae%

FMQ.

EBEDE-RIC WILLIAM BRADSHAEV, OF PERTH, WEST AUSTRALIA, AUSTRALIA.

CONSTRUCTION OF REENEORGED-GONCEETE COLUMNS OR POSTS.

inmate.

Application filed April 28,

i-iustralia, have invented certain new and useful Improvements Relating to the Construction of Reenforced-Goncrete Columns or Posts, of which the following is a specification.

The invention consists in a new form of reenforced concrete columns or posts which can be easily and cheaply made and which with a minimum of weight aifords great and uniform resistance to fiexure in all directions. The columns or posts can be usefully applied as telephone poles, pit props and for many other purposes.

According to the invention, the column or post is formed of longitudinal parts or sections, each part comprising a plurality of separate vertical members symmetrically disposed about a central longitudinal aperture, each member being reenforced by rods of iron or steel, some or all of which extend throughout the length of the column, each section resting on and being supported by a transverse diaphragm. The diaphragms are provided with a central aperture corresponding to the central space around which the vertical members are grouped, so that when the columns are used as telegraph or like posts conductors can be led through the axial aperture. The columns taper from the ground level both upwards and downwards, the lengths and sectional areas of each section being regulated by the stresses to which they are exposed.

In a preferred form, each section consists of four members and the reenforcing rods or wires pass through the members near their external surfaces. The diaphragms are, preferably, provided at their outer surfaces with recesses in which the rods or wires are embedded, a layer of concrete being added during the moulding operation so to enlarge the size of the diaphragms and encase the reenforcing members. The upper terminal section is, preferably, formed of a tube of rectangular or square section to which in the case of telegraph or like posts the arms carrying the insulated supports for the wires can be clamped.

The reenforcing members are bound together with binding wire, welded or otherwise securely fastened. For heavy constructions a loop may be formed where the rods Specification of Letters Patent.

Patented May 23, 1922.

1920. Serial No. 377,270.

or wires pass over the diaphragms and the binding wire may be threaded through the loops. The reenforcing members may be enclosed at the diaphragms by expanded metal or the like. the edges of which are bent over at the top and bottom of the diaphragms.

The accompanying drawings represent an example of a. construction according to the invention. Fig. 1 is an elevation, Figs. 2, 3, 4 and 5 horizontal sections on an enlarged scale taken, respectively, on the lines 2, 3,

et and 5 of Fig. 1.

In the example illustrated, A is a reenforce d telegraph pole comprising an upper terminal section a and-lower sections a -a" of which the sections a and are buried in the ground.

In the example illustrated each section is composed of four vertical members 5 -6 of the shape shown, symmetrically arranged round the central axial aperture 0. Beenforcinp' members (Z are formed in the heavier V constructions of iron or steel rods and in the lighter constructions of large gauge wire.

The sections rest ontransverse diaphragms Til -13 which also form caps for the sections immediately below them. The transverse dimensions of the sections and of the diaphragms vary according to the stresses to which the parts are exposed. The diaphragms are shown as octagonal in outline, though this form may be varied, and are provided with a central aperture 0 corresponding to the central space a in the longitudinal members.

The upper and lower faces are inclined at an angle of about 45 to the horizontal to prevent moisture from lodging on the surfaces.

The reenforcing members are embedded to a depth of about half their diameter in V-shaped recesses 6 provided in the external periphery of the sides of the diaphragms and in the moulding operation a layer of concrete 6 of not less than half an inch is added to the external dimensions of the diaphragms to protect the reenforcing members.

The number of the reenforcing rods or wires passing through each vertical member may vary with the sectional dimensions of the tapering column; in the example shown at the greatest section there are six rods or wires and at the smallest section four.

Loops or hooks are formed at the end of each reenforcing rod; for binding and straining purposes wires are wound round the the hooks to bind all the rods together and the loops are finally embedded within terminal.

lithic construction throughout their whole extent symmetrically disposed to form a hollow structure, transverse diaphragms arranged at intervals along the length of the column dividing said vertical members into sections and supporting said sections, and reenforcing means embedded in and extending longitudinally throughout said vertical members and secured to said transverse diaphragms. V

2. A reenforced concrete column comprising a plurality of vertical members of monolithic construction throughout their whole extent symmetrically disposed to form a hol low structure, transverse diaphragms arranged at intervals along the length of the column dividing said vertical members into sections and supporting said'sections and having recesses at their edges, reenforcing means seated in said recesses and embedded in and extending longitudinally of said Vertical members, and binding wire around the circumference of said diaphragms for securing and connecting said reenforcing means.

A reeni orced concrete column comprising a plurality of separate vertical members of monolithic construction throughout their whole extent symmetrically disposed to form a hollow structure transverse diaphragms div ding said vertical members mto sections rain-M5 and supporting said sections and having reformed in their edges, reenforcing means embedded in and extending longitulithic construction throughout their whole extent symmetrically disposed to form a hollow structure, transverse dlaphragms arranged at intervals along the length of the column dividing said vertlcal members into sectlons and supportlng said sectlons and having recesses at their edges reenforcing means seated in said recesses and embedded in and extending longitudinally of said vertical members, binding wire around the circumferenceot said diaphragms for securing and connecting said reenforcing means, and a layer of plastic material covering the periphery of said forcing means seated in said recesses.

5. A reenforced concrete column comprising four vertical members of monolithic construction throughout their whole extent symmetrically disposed to form a hollow structure, transverse diaphragms arranged at in tervals along the length of the column dividing said vertical members into sections and supporting said sections and metallic rods embedded in and extending longitudinally throughout said vertical members and secured to said transverse diaphragms.

In testimony whereof I have signed my name to this specification.

FREDERIC WILLIAM BRADSHAW.

diaphragms and the reen 

